7621321 has 4 divisors (see below), whose sum is σ = 8069652. Its totient is φ = 7172992.

The previous prime is 7621259. The next prime is 7621399. The reversal of 7621321 is 1231267.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 1550025 = 2464^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 7621321 - 2¹⁹ = 7097033 is a prime.

It is a super-3 number, since 3×7621321³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7621292 and 7621301.

It is not an unprimeable number, because it can be changed into a prime (7621421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224140 + ... + 224173.

It is an arithmetic number, because the mean of its divisors is an integer number (2017413).

Almost surely, 2^7621321 is an apocalyptic number.

It is an amenable number.

7621321 is a deficient number, since it is larger than the sum of its proper divisors (448331).

7621321 is a wasteful number, since it uses less digits than its factorization.

7621321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448330.

The product of its digits is 504, while the sum is 22.

The square root of 7621321 is about 2760.6740119036. The cubic root of 7621321 is about 196.7931986022.

Adding to 7621321 its reverse (1231267), we get a palindrome (8852588).

The spelling of 7621321 in words is "seven million, six hundred twenty-one thousand, three hundred twenty-one".